Add vegetable oil and cumin seeds. Allow it to splutter.
Add chopped onion, and sauté until it becomes translucent.
Then add ginger, garlic, serrano peppers, and tomatoes. And sauté for 1 minute.
Add cayenne pepper, ground turmeric, chopped potatoes, salt, and water.
Close the lid. And set the Instant pot for 7 minutes.
Once cooked, wait for 10 minutes to release the pressure.
Open the lid, gently mash 25% of the potato make the curry thicker.
Transfer to serving bowl, and garnish with cilantro. Enjoy with rice, Indian roti, or naan bread.
Notes
Adjust the spice level by increasing or reducing the amount of serrano peppers and cayenne pepper based on your heat tolerance.
You can substitute fresh tomatoes with canned crushed tomatoes and swap serrano peppers with Thai green chilies.
Store leftovers in an airtight container in the refrigerator for up to 3 days or freeze for up to 2 months. Thaw overnight and reheat with a splash of water.
Stovetop Potato Curry: To make this on the stovetop, follow the same sauté steps in a pan. Add an extra half cup of water to help the potatoes cook to perfection, and simmer until tender.